My hesitation in showing code for simply concatenating the values together with join is that that is such a standard and trivial thing to do that I couldn't believe that that was the solution you were looking for. roboticus's reply++ tells you how to do that and also fills in details for using a table join to use davido's suggested technique.

If it really is the case that you were struggling with concatenating a list of strings I strongly advise you show us more of your code and ask for comment in a new Seekers of Perl Wisdom node as there are very likely other areas where your code could use some constructive criticism.